A little theory about Arya and Sandor (Spoilers Extended)

This is nothing fancy, I just had a thought that I wanted to put to the community. The culmination of Arya and Sandor's trip through the Riverlands is him dying of an infected wound, begging her to kill him, and her refusing. But what if this foreshadows Arya truly deciding to put Sandor out of his misery at some point in the future? Say... If he got resurrected as a wight?